I'm not sure it's a factor but the was a fad in the '80s or so for using what are now called Hand Grippers. I don't know how wide spread that fad was but if th

I'm not sure it's a factor but the was a fad in the '80s or so for using what are now called Hand Grippers. I don't know how wide spread that fad was but if that was when the norms were established, it might bare considering.